1) directed line segment
有向线段
2) convex hulls/oriented line segment
凸包/有向线段
3) Numerical product of the directed line segment
有向线段的数量积
4) directional arc
有向弧段
1.
Two new attributes are added to arcs,one for the direction and another for whether the directional arc has been visited.
文章提出了一种基于有向弧段的多边形拓扑关系生成算法,改进了传统算法。
5) Effective line
有效线段
6) having direction's smooth or (sectionally)unilaterally smooth (curves)cambers
有向光滑或分(段)片光滑曲(线)面
补充资料：有向线段
规定了起点和终点的线段叫做有向线段．表示有向线段时，要将表示起点的字母写在前面，表示终点的字母写在后面．
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条